CDC collects, compiles, and analyzes information on influenza activity year round in the United States and produces FluView, a weekly influenza surveillance report, from October through mid-May. The collection of these data enables CDC to:
- find out when and where influenza activity is occurring
- track influenza-related illness
- determine what influenza viruses are circulating
- detect changes in influenza viruses, and
- measure the effect influenza is having on deaths in the United States.